First - hoooray for Mega support.
Second - tested the account and it is working well, even unregistred File Uploader can add and check the Mega account and it is working. So far, so good
Third - of course, bugses are expected with experimental first testing. That is something we have to count on... Hopefully someone persuade Mega to allow anon uploading too, as this is kinda important for us...
Keep trying to push Mega to do it, guys. Thanks to autor and all who contributed! (I hopefully soon contribute too)